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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300/* * JFFS2 -- Journalling Flash File System, Version 2. * * Copyright © 2001-2007 Red Hat, Inc. * * Created by David Woodhouse <dwmw2@infradead.org> * * For licensing information, see the file 'LICENCE' in this directory. * */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>#include <linux/slab.h>#include <linux/init.h>#include <linux/jffs2.h>#include "nodelist.h"
/* These are initialised to NULL in the kernel startup code. If you're porting to other operating systems, beware */static struct kmem_cache *full_dnode_slab;static struct kmem_cache *raw_dirent_slab;static struct kmem_cache *raw_inode_slab;static struct kmem_cache *tmp_dnode_info_slab;static struct kmem_cache *raw_node_ref_slab;static struct kmem_cache *node_frag_slab;static struct kmem_cache *inode_cache_slab;#ifdef CONFIG_JFFS2_FS_XATTRstatic struct kmem_cache *xattr_datum_cache;static struct kmem_cache *xattr_ref_cache;#endif
int __init jffs2_create_slab_caches(void){ full_dnode_slab = KMEM_CACHE(jffs2_full_dnode, 0); if (!full_dnode_slab) goto err;
raw_dirent_slab = KMEM_CACHE(jffs2_raw_dirent, SLAB_HWCACHE_ALIGN); if (!raw_dirent_slab) goto err;
raw_inode_slab = KMEM_CACHE(jffs2_raw_inode, SLAB_HWCACHE_ALIGN); if (!raw_inode_slab) goto err;
tmp_dnode_info_slab = KMEM_CACHE(jffs2_tmp_dnode_info, 0); if (!tmp_dnode_info_slab) goto err;
raw_node_ref_slab = kmem_cache_create("jffs2_refblock", sizeof(struct jffs2_raw_node_ref) * (REFS_PER_BLOCK + 1), 0, 0, NULL); if (!raw_node_ref_slab) goto err;
node_frag_slab = KMEM_CACHE(jffs2_node_frag, 0); if (!node_frag_slab) goto err;
inode_cache_slab = KMEM_CACHE(jffs2_inode_cache, 0); if (!inode_cache_slab) goto err;
#ifdef CONFIG_JFFS2_FS_XATTR xattr_datum_cache = KMEM_CACHE(jffs2_xattr_datum, 0); if (!xattr_datum_cache) goto err;
xattr_ref_cache = KMEM_CACHE(jffs2_xattr_ref, 0); if (!xattr_ref_cache) goto err;#endif
return 0; err: jffs2_destroy_slab_caches(); return -ENOMEM;}
void jffs2_destroy_slab_caches(void){ kmem_cache_destroy(full_dnode_slab); kmem_cache_destroy(raw_dirent_slab); kmem_cache_destroy(raw_inode_slab); kmem_cache_destroy(tmp_dnode_info_slab); kmem_cache_destroy(raw_node_ref_slab); kmem_cache_destroy(node_frag_slab); kmem_cache_destroy(inode_cache_slab);#ifdef CONFIG_JFFS2_FS_XATTR kmem_cache_destroy(xattr_datum_cache); kmem_cache_destroy(xattr_ref_cache);#endif}
struct jffs2_full_dirent *jffs2_alloc_full_dirent(int namesize){ struct jffs2_full_dirent *ret; ret = kmalloc(sizeof(struct jffs2_full_dirent) + namesize, GFP_KERNEL); dbg_memalloc("%p\n", ret); return ret;}
void jffs2_free_full_dirent(struct jffs2_full_dirent *x){ dbg_memalloc("%p\n", x); kfree(x);}
struct jffs2_full_dnode *jffs2_alloc_full_dnode(void){ struct jffs2_full_dnode *ret; ret = kmem_cache_alloc(full_dnode_slab, GFP_KERNEL); dbg_memalloc("%p\n", ret); return ret;}
void jffs2_free_full_dnode(struct jffs2_full_dnode *x){ dbg_memalloc("%p\n", x); kmem_cache_free(full_dnode_slab, x);}
struct jffs2_raw_dirent *jffs2_alloc_raw_dirent(void){ struct jffs2_raw_dirent *ret; ret = kmem_cache_alloc(raw_dirent_slab, GFP_KERNEL); dbg_memalloc("%p\n", ret); return ret;}
void jffs2_free_raw_dirent(struct jffs2_raw_dirent *x){ dbg_memalloc("%p\n", x); kmem_cache_free(raw_dirent_slab, x);}
struct jffs2_raw_inode *jffs2_alloc_raw_inode(void){ struct jffs2_raw_inode *ret; ret = kmem_cache_alloc(raw_inode_slab, GFP_KERNEL); dbg_memalloc("%p\n", ret); return ret;}
void jffs2_free_raw_inode(struct jffs2_raw_inode *x){ dbg_memalloc("%p\n", x); kmem_cache_free(raw_inode_slab, x);}
struct jffs2_tmp_dnode_info *jffs2_alloc_tmp_dnode_info(void){ struct jffs2_tmp_dnode_info *ret; ret = kmem_cache_alloc(tmp_dnode_info_slab, GFP_KERNEL); dbg_memalloc("%p\n", ret); return ret;}
void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *x){ dbg_memalloc("%p\n", x); kmem_cache_free(tmp_dnode_info_slab, x);}
static struct jffs2_raw_node_ref *jffs2_alloc_refblock(void){ struct jffs2_raw_node_ref *ret;
ret = kmem_cache_alloc(raw_node_ref_slab, GFP_KERNEL); if (ret) { int i = 0; for (i=0; i < REFS_PER_BLOCK; i++) { ret[i].flash_offset = REF_EMPTY_NODE; ret[i].next_in_ino = NULL; } ret[i].flash_offset = REF_LINK_NODE; ret[i].next_in_ino = NULL; } return ret;}
int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int nr){ struct jffs2_raw_node_ref **p, *ref; int i = nr;
dbg_memalloc("%d\n", nr);
p = &jeb->last_node; ref = *p;
dbg_memalloc("Reserving %d refs for block @0x%08x\n", nr, jeb->offset);
/* If jeb->last_node is really a valid node then skip over it */ if (ref && ref->flash_offset != REF_EMPTY_NODE) ref++;
while (i) { if (!ref) { dbg_memalloc("Allocating new refblock linked from %p\n", p); ref = *p = jffs2_alloc_refblock(); if (!ref) return -ENOMEM; } if (ref->flash_offset == REF_LINK_NODE) { p = &ref->next_in_ino; ref = *p; continue; } i--; ref++; } jeb->allocated_refs = nr;
dbg_memalloc("Reserved %d refs for block @0x%08x, last_node is %p (%08x,%p)\n", nr, jeb->offset, jeb->last_node, jeb->last_node->flash_offset, jeb->last_node->next_in_ino);
return 0;}
void jffs2_free_refblock(struct jffs2_raw_node_ref *x){ dbg_memalloc("%p\n", x); kmem_cache_free(raw_node_ref_slab, x);}
struct jffs2_node_frag *jffs2_alloc_node_frag(void){ struct jffs2_node_frag *ret; ret = kmem_cache_alloc(node_frag_slab, GFP_KERNEL); dbg_memalloc("%p\n", ret); return ret;}
void jffs2_free_node_frag(struct jffs2_node_frag *x){ dbg_memalloc("%p\n", x); kmem_cache_free(node_frag_slab, x);}
struct jffs2_inode_cache *jffs2_alloc_inode_cache(void){ struct jffs2_inode_cache *ret; ret = kmem_cache_alloc(inode_cache_slab, GFP_KERNEL); dbg_memalloc("%p\n", ret); return ret;}
void jffs2_free_inode_cache(struct jffs2_inode_cache *x){ dbg_memalloc("%p\n", x); kmem_cache_free(inode_cache_slab, x);}
#ifdef CONFIG_JFFS2_FS_XATTRstruct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void){ struct jffs2_xattr_datum *xd; xd = kmem_cache_zalloc(xattr_datum_cache, GFP_KERNEL); dbg_memalloc("%p\n", xd); if (!xd) return NULL;
xd->class = RAWNODE_CLASS_XATTR_DATUM; xd->node = (void *)xd; INIT_LIST_HEAD(&xd->xindex); return xd;}
void jffs2_free_xattr_datum(struct jffs2_xattr_datum *xd){ dbg_memalloc("%p\n", xd); kmem_cache_free(xattr_datum_cache, xd);}
struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void){ struct jffs2_xattr_ref *ref; ref = kmem_cache_zalloc(xattr_ref_cache, GFP_KERNEL); dbg_memalloc("%p\n", ref); if (!ref) return NULL;
ref->class = RAWNODE_CLASS_XATTR_REF; ref->node = (void *)ref; return ref;}
void jffs2_free_xattr_ref(struct jffs2_xattr_ref *ref){ dbg_memalloc("%p\n", ref); kmem_cache_free(xattr_ref_cache, ref);}#endif